Floor construction



CY T. A LU Aug. 1933' FLOOR CONSTRUCTION Filed June I 1 p x zoo o ...o o

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.H M.. .H $3 3..... .I u H H N N N v ....u........ fl 34.... .v 1 I v 9 2: .2. 00 04 ........v ....1 w vwumwi concrete is poured into the -to the girder by steel Patented Aug. 15, 1933 UNITED STATES 1,922,053 FLOOR ODNSTRUCTION Thomas A. Lucy, Canton, Ohio, assignor to Ingalls Steel Products Company, Birmingham,

Ala.

Application June 1, 1931. Serial No. 541,215 6 Claims. (Cl. 72-71) This invention pertains to floor construction and more particularly to concrete floor construction in which metal joists are used to support the floor.

The ordinary floor construction in which steel supports are used usually involves an arrangement in which a main girder supports a series of laterally extending joists. The joists are supported at their ends on the girder. Usually metal lath is laid over the joists and the concrete slab is laid on the metal lath. Where the joints rest on the girder the lath is usually extended downwardly to the upper cord of the girder and the channel so provided so that the ends of the joists are embedded in the concrete.

As steel joists as usually constructed take an appreciable sag under load, a floor of this type .has a tendency to sag somewhat at the middle of the span of the joists. Such sag takes place on both sides of the supporting girder. The sag of the concrete slab on both sides of the girder has a tendency to cause cracking of the concrete just over the girder at which point a tensile stress is produced in the concrete by this sag of the floor.

One of the objects of this invention, therefore, is to provide a floor construction which will obviate this tendency to crack the concrete over the supporting girders. Another object is to provide such a construction which will be cheap and simple to apply Without changing other features of the floor design.

Further objects will appear from the following description taken in connection with the accompanying drawing, which shows a perspective view, with parts in section, of a floor construction embodying this invention.

Referring to the drawing, (1) designates a supporting girder upon which the ends of a series of metal joists (2) are supported. The joists (2) extend in opposite directions, perpendicularly to the girder. These joists are usually secured anchors (3) of any design suitable.

Metal lath (4) may be laid on the joists (2) and secured thereto in any suitable manner. Where the joists rest on the girder (l) the lath may be folded downwardly as indicated at (5) so as to provide a channel along the girder, the upper face of the girder itself forming the bottom of the channel. The concrete slab (6) is then poured on the lath (4) in any suitable "manner and fills up the channel formed by the vertical portions (5) and the top of the girder 1) The portion filling this channel surrounds the ends of the joists (2) and by embedding them securely in the concrete serves to anchor them more securely to the girder and to brace them against lateral movement of any kind. Nailing 0 strips ('7) may be laid in the top of the slab (6) according to well known practice and the floor (8) may be nailed to the strips ('7).

In order to avoid the formation of cracks along the top of the girder (1) reinforcing material of any suitable kind is embedded in the slab (6) extending across the top of the girder. As illustrated in the drawing, a series of steel tension rods (9) is laid over the top of the girder with the rods extending crosswise of the girder and their ends extending beyond the edges of the girder to a sufiicient distance to insure secure anchorage in the slab (6) for supporting the tension involved. Any other suitable type of reinforcing material, such as a woven mesh material or the like may of course be used in place of the rods (9) These reinforcing members are spaced above the girder (1) so as to be embedded in the upper portion of the concrete slab. In this position they are best adapted to support the transverse tension induced in the concrete by the sagging of the floor on each side of the girder.

It has been found that the construction of this invention provides an eifective cure for the tendency of the concrete to crack along the top of a girder in this type of floor construction. The device is cheap and simple to apply.

It is obvious that various changes may be made in the details of construction within the scope of the appended claims without departing from the spirit of this invention, and that the invention is not limited to the specific details shown and/or described.

Having thus described claimed is:

1. In a floor construction, in combination, a floor-supporting girder, metallic joists resting at 1 their ends on said girder and extending laterally in opposite directions therefrom, a concrete slab supported by and extending over said joists and said girder, and in which the ends of said joists are embedded, and a reinforcing element embedded in the upper portion of said slab and extending laterally across said girder and bridging the ends of said joists.

2. In a floor construction, in combination, a floor-supporting girder, metal joists resting at their ends on said girder and extending laterally in opposite directions therefrom, aconcrete slab supported by and extending over said joists and the invention, What is 9 said girder, and in which the ends of said joists are embedded, and a reinforcing element embedded in the upper portion ofsaid slab and extending laterally across and beyond said girder and bridging the ends of said joists.

3. A floor construction in which a girder supports the ends of a plurality of metallic floorsupporting joists which rest at their ends upon and extend in opposite directions from said girder, and a concrete floor slab is supported by and extends over said joists and said girder, characterized by the feature that the ends of said joists are embedded in said slab and a reinforcing element is embedded in the upper portion of said slab to extend laterally across and beyond said girder so as to bridge the ends of the oppositely extending joists in order to absorb tension stress in the top of said slab over said girder.

4. A floor construction in which a girder supports the ends of a plurality of metallic floorsupporting joists which rest at their ends upon and extend in opposite directions from said girder, and a concrete slab is supported by and extends over said joists and said girder, the ends of said joists being embedded in said slab, characterized by the feature that a reenforcing element is embedded in the upper portion of said slab to extend laterally across and beyond said girder so as to bridge the ends of the oppositely extending joists, whereby tension stress in the top of said slab over said girder may be absorbed by said element in order to prevent cracking of the slab at that point.

5. In a floor or ceiling construction, a girder, a plurality of joists resting at their ends on said girder and extending laterally in opposite directions therefrom, a concrete slab extending over said joists and embedding the ends thereof, and a reenforcing element embedded in the top of said slab and extending laterally of said girder to bridge said ends of said joists.

6. In a floor or ceiling construction, a girder, a plurality of joists supported at their ends only on said girder and extending laterally in opposite directions therefrom, a concrete slab extending over said joists and embedding the ends thereof, and a reenforcing element embedded in the top of said slab and extending laterally of said girder across the gap between said ends of said joists.

. THOMAS A. LUCY. 

